The story
- Classical Latin · derived fromprōmptus
- Late Latin · derived fromprōmptitūdō
- Middle English · inherited frompromptitude
- English todaypromptitude
From Middle English promptitude, from Late Latin prōmptitūdō, from Classical Latin prōmptus. By surface analysis, prompt + -itude.
Etymology from Wiktionary, CC BY-SA 4.0.